<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=\], initial-scale=1.0">
    <title>dom</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <h1 class="title">hello world</h1>
    <button>click me</button>
    <ul>
        <li id="list" class="li-class">first</li>
        <li id="list">second</li>
        <li id="list">third</li>
    </ul>
</body>
</html>